19-06-2023, 07:38 PM
(This post was last modified: 19-06-2023, 07:40 PM by Geordie McBoyne.)
The video channel bandwidth was fine for 441 lines but a bit narrow for 525. The active video part is about the same as the 625 line systems in use in Europe. I believe the active video is 50microseconds or so. So the 525 pictures have better vertical definition but the trade off was a loss of horizontal definition. 441 had negative video modulation, equalising pulses and AM sound. I guess the frame blanking period robbed the 441 line system of a good number of lines.
Possible to realign the sound IF response to operate as an FM slope demodulator?
The 441 line TV service from the Paris Eiffel Tower transmitter had positive video modulation, AM sound and no equalising pulses. Eight broad frame pulses just like our 405 line system.
The number of active lines was 385, the same as 405.
Geordie McBoyne.
Possible to realign the sound IF response to operate as an FM slope demodulator?
The 441 line TV service from the Paris Eiffel Tower transmitter had positive video modulation, AM sound and no equalising pulses. Eight broad frame pulses just like our 405 line system.
The number of active lines was 385, the same as 405.
Geordie McBoyne.
